In testis, the immature germ cells produce sperm by $...A...$ at puberty $...B...$ present on the inside wall of seminiferous tubules multiply by$ ...C..$. division and increase their number. Identify $A$,$B$ and $C$ from the above statement

When male ejaculates sperms during coitus of which for normal fertility at least....... percent sperms must have normal shape and size and at least ...........per cent of them must show vigorous motility

$A$ - Acrosome possesses mitochondria.

$R$ -Middle piece of sperm is filled with enzymes

Given below are two statements :

Statement $I$ :

The release of sperms into the seminiferous tubules

is called spermiation.

Statement $II$ :

Spermiogenesis is the process of formation of sperms from spermatogonia.

In the light of the above statements, choose the most appropriate answer from the options given below:

In human females, meiosis­-$II$ is not completed until

The figure shows a section of human ovary. Select the option which gives the correct identification of either $A$ or $B$ with function/ characteristic.